Chicago Pneumatic Tool Company

John Knott

Jack Pressley

David M Young

Pradip K Paul

Richard Wilusz

Thomas Wastowicz

A retainer for a pneumatic tool and assembly therefor is disclosed. The retainer includes a tool body having an internal surface defining a bore and an external surface having a threaded portion. A retainer cap is used with the tool body and includes an internal surface having a threaded portion adapted to engage the threaded portion of the tool body. An insert having an outer surface is rotatably mounted in the retainer cap. The insert includes an inner surface with a first inner surface portion adapted for conforming with a non-circular lug surface of a tool shank and a second inner surface portion radially offset from the first portion adapted for conforming with the non-circular lug surface.

Retainer for a pneumatic tool

The invention is a pneumatic impact hammer in which the vibrations created in the motor portion of the tool are substantially reduced prior to reaching the tool's handle portion. The motor portion is allowed to move relative to the tool's handle portion and is located within a handle-attached cylindrical housing. Low-friction plastic bearings are located between the motor portion and the surrounding housing. The cycling valve that controls the reciprocating movement of the tool's piston is attached to the motor and receives air from a flexible air inlet tube that is slidably engaged to the motor and is secured to the tool's handle portion.

Vibration-reduced pneumatic tool

The invention is a safety mechanism for an air-powered tool. The mechanism senses the position of the tool's implement retainer and disables the air flow to the tool's motor if the retainer is not in its locked position. The mechanism employs a pushrod that has one end adapted to contact a rear surface of the retainer when the retainer is in its lock position. The other end of the pushrod is adapted to contact a spring-biased ball-type check valve located within the air inlet to the tool's motor. When the retainer is removed from the tool, the pushrod moves forwardly under the urging of the valve and at the same time allows the valve to move to its closed position to thereby prevent any flow of pressurized air to the motor.

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New Hartford, NY, United States of America

John Knott